/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.tools.idea.sqlite.databaseConnection

import com.android.tools.idea.sqlite.model.ResultSetSqliteColumn
import com.android.tools.idea.sqlite.model.SqliteQueryResult
import com.google.common.util.concurrent.Futures
import com.google.common.util.concurrent.ListenableFuture

/** Implementation of [SqliteResultSet] that is empty. */
class EmptySqliteResultSet : SqliteResultSet {
  override val totalRowCount: ListenableFuture<Int> = Futures.immediateFuture(0)

  override val columns: ListenableFuture<List<ResultSetSqliteColumn>> =
    Futures.immediateFuture(emptyList())

  override fun getRowBatch(rowOffset: Int, rowBatchSize: Int): ListenableFuture<SqliteQueryResult> =
    Futures.immediateFuture(SqliteQueryResult(emptyList()))

  override fun dispose() {}
}
